Fuel cell system and method for recycling exhaust

H - Electricity – 01 – M

Patent

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H01M 8/04 (2006.01)

Patent

CA 2457908

A fuel cell system and method in which fuel exhaust from a fuel cell stack is recycled to a fuel side stack inlet by way of a fuel exhaust recycle line and a jet pump. A primary fuel stream at an inlet provides the motive power for the jet pump and the jet pump has a variable nozzle geometry to entrain variable proportions of fuel exhaust in the primary fuel in order to maintain desired fuel flow volumes across the anode-side of the fuel cell stack on turndown of the stack and to facilitate enhanced fuel utilization by the stack.

L'invention concerne un dispositif de pile à combustible (1) et un procédé dans lequel le combustible usé d'un empilement de piles à combustible (6) est remis en circulation dans un orifice d'admission du combustible (5) au moyen d'une conduite de recirculation du combustible usé (8) et d'une pompe à jet (4). Un flux de combustible principal passant par un orifice d'admission (3) génère la force motrice nécessaire à la pompe à jet (4), laquelle présente une configuration de buses variable destinée à entraîner des proportions variables de combustible usé dans le combustible principal afin de maintenir les débits voulus de combustible dans le côté anode de l'empilement de piles à combustible lorsque l'empilement est réglé et afin d'assurer une meilleure utilisation du combustible par l'empilement.

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